> It would be helpful to know which terminal on the long connector into
> the right side of the instrument cluster operates the turn signal. If
> that's not getting 12 intermittently with the wipers, and the turn
> signals are working, then the problem must be in the wiring between
> the relay and the connector. If it is getting intermittent 12v with
> the wipers, the problem must be either in the connector, the blue
> foil or the LED itself.

(looking through my irrationally large collection of instrument
clusters-- 6 pre-86, 2 late model)
OK, so sitting in front of the cluster and craning your neck forward
to look down behind it, and pulling the wiring harness connector off
and moving it (don't turn it!) to where you can see it:

early type: connector is vertical; turn signal is the bottom most one
late type: connector is horizontal; turn signal is the fifth one over,
counting from the left

--
John Bange
'90 Vanagon - "Geldsauger"